Understanding domain wall (DW) motion in nanoscale ferromagnetic structures
reveals intriguing physics, with potential applications in nanoscale devices
and DW data storage. One challenge is to create and move individual DWs in
arbitrary locations. We developed a technique to generate localized circular
magnetic field by applying a current through the tip of the atomic force
microscope (AFM) and thereby manipulating the state of ferromagnetic
rings [1]. Now we extend our ability to control domain walls in various
structures, such as straight wires with notches and zigzag wires. By placing
the tip near a 180 DW in a vertex of a zigzag wire, we can move the 180 DW
along the wire and form a stable 360 DW in nearby vertex. We can also move
360 DWs with the local magnetic field around the AFM tip. We will discuss
simulations and experimental implementations.
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[1] T. Yang, N. R Pradhan, A Goldman, A. Licht, Y. Li, M T. Tuominen and K. E. Aidala, Applied Physics Letter, http://apl.aip.org/resource/1/applab/v98/i24/p242505\_s1 98, 242505, (2011)

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.V13.4